CleverDeck - Learn languages more efficiently with spaced repetition
StudySmarter - Your lecture notes, flashcards, summaries, learning with friends, statistics, and even rewards for learning - all in one place and just a click away - StudySmarter.
ACT Flashcards from Magoosh - Everything you should have learned in high school
Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
Avokado - Language learning app
Brainscape - Find, create, and study SMART FLASHCARDS on any device. DOUBLE your learning speed using the most effective study system on the planet. Keep all your content in sync across Brainscape's website and your Android devices.